How about some weather-related photos with trains. Rain, snow, Thunderstorm-you name it. Dig into your archives for these-if you need to. I'll start off with a foggy shot at ADM in Cedar Rapids with the CRANDIC:
FLOOD WARNING!!!! From the Flood of 2008 in Cedar Rapids, IA-the CRANDIC bridge before it was washed out.
"Neither snow... nor rain... not heat... nor gloom of night... stays these couriers from the swift completion of their appointed rounds."